Hi I have just purchased online another 2gb stick to add to what is already in my pc. The ram is the same brand and speed but on opening I noticed the timing is CL6 compared to the CL5 which I already have installed. Is this going to be a problem, will there be any noticeable difference in speed? Is it worth sending back for a correct replacement or should I just install it anyway as I 'll never notice the difference? Many thanks for any advice.